[en] Aluminum-23 was produced in two 40 MeV proton bombardments of Mg targets at LBNL's 88-Inch Cyclotron. Reaction products were transported by helium jet to a detection chamber. They were observed by two low-energy particle-identification telescopes; each consisted of two gas-ΔE detectors, a thin (<70 μm) Si E detector and a 300 μm Si E-reject detector. Contrary to previous measurements, the lowest energy peak in the spectrum was observed at an energy of 246±20 keV with 33±3% of the intensity of the peak at 838±5 keV. Implications for isospin mixing and the proton-capture width of the ²³Al isobaric analog state in ²³Mg are discussed. Other weak beta-delayed proton-decay branches were also observed with energies up to ∼2200 keV

[en] BEARS is an initiative to develop a radioactive ion-beam capability at Lawrence Berkeley National Laboratory. The aim is to produce isotopes at an existing medical cyclotron and to accelerate them at the 88'' Cyclotron. To overcome the 300-meter physical separation of these two accelerators, a carrier-gas transport system will be used. At the terminus of the capillary, the carrier gas will be separated and the isotopes will be injected into the 88'' Cyclotron's Electron Cyclotron Resonance (ECR) ion source. The first radioactive beams to be developed will include 20-min ¹¹C and 70-sec ¹⁴O, produced by (p,n) and (p, α) reactions on low-Z targets. A test program is currently being conducted at the 88'' Cyclotron to develop the parts of the BEARS system. Preliminary results of these tests lead to projections of initial ¹¹C beams of up to 2.5x10⁷ ions/sec and ¹⁴O beams of 3x10⁵ ions/sec

[en] BEARS is an initiative to develop a radioactive ion-beam capability at Lawrence Berkeley National Laboratory. The aim is to produce isotopes at an existing medical cyclotron and to accelerate them at the 88'' Cyclotron. To overcome the 300-meter physical separation of these two accelerators, a carrier-gas transport system will be used. At the terminus of the capillary, the carrier gas will be separated and the isotopes will be injected into the 88'' Cyclotron's Advanced Electron Cyclotron Resonance ion source. The first radioactive beams to be developed will include 20-min ¹¹C and 70-sec ¹⁴O, produced by (p, n) and (p, α) reactions on low-Z targets. Tests at the 88'' Cyclotron lead to projections of initial ¹¹C beams of 2x10⁸ ions/sec ¹⁴O beams of 1x10⁶ ions/sec. Construction of BEARS is expected to be completed in the spring of 1999

[en] An attempt to confirm the reported direct one-proton and two-proton decays of the (21+) isomer at 6.7(5) MeV in ⁹⁴Ag has been made. The 0.39(4) s half-life of the isomer permitted use of a helium-jet system to transport reaction products from the ⁴⁰Ca+^natNi reaction at 197 MeV to a low-background area; 24 gas ΔE-(Si)E detector telescopes were used to identify emitted protons down to 0.4 MeV. No evidence was obtained for two-proton radioactivity with a summed energy of 1.9(1) MeV and a branching ratio of 0.5(3)%. Two groups of one-proton radioactivity from this isomer had also been reported; our data confirm the lower energy group at 0.79(3) MeV with its branching ratio of 1.9(5)%.

[en] A 120 MeV ¹⁵O radioactive ion beam with an intensity on target of 4.5x10⁴ pps has been developed at the 88-Inch Cyclotron at the Lawrence Berkeley National Laboratory. This beam has been used to study the level structure of ¹⁶F at low energies via the p(¹⁵O, p) reaction using the thick target inverse kinematics method on a polyethylene target. The experimental excitation function was analyzed using R-matrix calculations. Significantly improved values for the level widths of the four low-lying states in ¹⁶F are reported. Good agreement with the theoretical spectroscopic factors is also obtained

[en] The level structure of ¹²N has been investigated from 2.2 to 11.0 MeV in excitation energy using a ¹¹C+p resonance interaction with thick targets and inverse kinematics. Excitation functions were fitted using an R-matrix approach. Sixteen levels in ¹²N were included in the analysis, several of them are new. Spin-parity assignments, excitation energies and widths are proposed for these levels